My tuning issues - ZR-1 Net Registry Forums

XfireZ51 · 05-18-2008

Just like =Jeff=, I decided to do a scan on my motor the other day trying to tweak and optimize tthe tune now that I'm back from BG. Prior to going, BLMs were in the 124-132 range depending. Idle was fine.
But with the latest scans, idle BLM is sitting at 115 both sides and INT is at 100. ECM is adding fuel although I have taken fuel out of the VE tables.
Motor transitions smoothly from Open to Closed loop. Idles at 725-750rpm.
And it doesn't smell rich once warmed up. Idle injector PW seems a bit high at 4ms. As I said in a previous post, Left side 02 appears a bit lazier than right but they track pretty closely to each other. No codes although I did have a VAL 66 which is a shorted or shunted VALET switch code. However as of last scan, that did not appear.
I'm thinking some kind of exhaust leak particulalrly given that the low BLMs are in the lower MAP region where vacuum is high and would suck in fresh air. That would explain why motor runs better than scan would indicate. Whatever it is appears to affect both sides equally and I am not sure where an exhaust leak could happen which would affect both sides.

05-18-2008	#1
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,708	My tuning issues Just like =Jeff=, I decided to do a scan on my motor the other day trying to tweak and optimize tthe tune now that I'm back from BG. Prior to going, BLMs were in the 124-132 range depending. Idle was fine. But with the latest scans, idle BLM is sitting at 115 both sides and INT is at 100. ECM is adding fuel although I have taken fuel out of the VE tables. Motor transitions smoothly from Open to Closed loop. Idles at 725-750rpm. And it doesn't smell rich once warmed up. Idle injector PW seems a bit high at 4ms. As I said in a previous post, Left side 02 appears a bit lazier than right but they track pretty closely to each other. No codes although I did have a VAL 66 which is a shorted or shunted VALET switch code. However as of last scan, that did not appear. I'm thinking some kind of exhaust leak particulalrly given that the low BLMs are in the lower MAP region where vacuum is high and would suck in fresh air. That would explain why motor runs better than scan would indicate. Whatever it is appears to affect both sides equally and I am not sure where an exhaust leak could happen which would affect both sides.